class Settings():
    """存储《外星人入侵》所有设置的类"""

    def __init__(self):
        """初始化游戏的静态设置"""
        #  屏幕设置
        self.screen_width=900
        self.screen_height=726
        self.bg_color=(230,230,230)

        # 飞船的设置
        self.ship_limit = 3

        # 子弹设置
        self.bullet_width=3
        self.bullet_height=15
        self.bullet_color=60,60,60
        self.bullets_allowed=3

        # 外星人设置

        self.fleet_drop_speed = 10


        # 加快游戏节奏的速度
        self.speedup_scale = 1.1
        # 外星人点数的提高速度
        self.score_scale = 1.5

        self.initialize_dynamic_settings()

    def initialize_dynamic_settings(self):
        """初始化随游戏进行而变化的设置"""
        self.ship_speed_factor = 1.5
        self.bullet_speed_factor = 3
        self.alien_speed_factor = 1

        # fleet_direction为1表示向右移，为-1表示向左移
        self.fleet_direction = 1

        # 记分
        self.alien_points = 50

    def increase_speed(self):
        """提高速度设置和外星人点数"""
        self.ship_speed_factor *= self.speedup_scale
        self.bullet_speed_factor *= self.speedup_scale
        self.alien_speed_factor *= self.speedup_scale

        self.alien_points = int(self.alien_points * self.score_scale)
